What is this?
a) a space probe
b) an astronomer
a) a space probe = a small, unmanned spacecraft
What is this?
a) unique
b) matter
a) unique = something that is different from anything else
What is this?
a) craters
b) orbit
a) craters = holes in the surface of something, caused by something hitting it
What is this?
a) core
b) surface
b) surface = the outside, or top layer of something
What is this?
a) distance
b) diameter
a) distance = how far from each other two places are
What is this?
a) distance
b) an astronomer
b) an astronomer = someone who studies space
What is this?
a) matter
b) core
b) core - the earth's core is nearly 3000 km below its surface
What is this?
a) matter
b) orbit
a) matter = everything around you is made of matter
What is this?
a) distance
b) diameter
b) diameter = the measurement of an object through its centre
What is this?
a) gravity
b) core
a) gravity = the force a planet uses to draw objects to its centre
What is this?
a) gravity
b) orbit
b) orbit = the path an object takes around another in space